oklahomas test section at ncat track amap 12 th annual conference western crown center hotel kansas...
TRANSCRIPT
![Page 1: Oklahomas Test Section at NCAT Track AMAP 12 th Annual Conference Western Crown Center Hotel Kansas City, MO February 16, 2011 Kenneth Ray Hobson, P.E](https://reader037.vdocuments.net/reader037/viewer/2022103015/55157189550346a1418b50ed/html5/thumbnails/1.jpg)
Oklahoma’s Test Section at NCAT Track
AMAP 12th Annual ConferenceWestern Crown Center Hotel
Kansas City, MOFebruary 16, 2011
Kenneth Ray Hobson, P.E. –Kenneth Ray Hobson, P.E. – Bituminous Bituminous EngineerEngineer
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Topics
• Test Sections – N8 and N9
• History of Performance
• N8 Repairs
• Success vs. Failures
• Use of Knowledge
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OK Sections
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OK Sections
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2006 N8 and N9 History Perpetual Pavement Design
• N8 and N9 on Soft Clay Subgrade‒ N8: 10" HMA‒ N9 : 14" HMA
• RBL Bottom Lift for Both
• N9 - Successful
• N8 - Cracked
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• N9: Continue Traffic
• N8: Mill and Replace Top Two Lifts
• N8: Retard Cracking by Two Fabrics
2009 N8 and N9 History Retard Cracking
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N8 Reflective Cracking to RetardN8 Reflective Cracking to Retard
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N8 Cracking at 2.7 MESALs
0
2
4
6
8
10
12
25 50 75 100 125 150 175
Tra
nsv
erse
Off
set
(fee
t)
Longitudinal Distance from Far Transverse Joint (feet)
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Microstrain Comparison
N8 Strain = 21.487e0.0335*Temperature
R2 = 0.96
N9 Strain = 11.496e0.0298*Temperature
R2 = 0.9217
0
200
400
600
800
1000
1200
1400
0 20 40 60 80 100 120 140
Mid-Depth Temperature, F
Te
nsi
le M
icro
stra
in
N8 N9
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More Distress at 3.4 MESALs
0
2
4
6
8
10
12
25 50 75 100 125 150 175
Tra
nsv
erse
Off
set
(fee
t)
Longitudinal Distance from Far Transverse Joint (feet)
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June 16, 2010 Repair
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Terminal Distress at 3.8 MESALs
0
2
4
6
8
10
12
25 50 75 100 125 150 175
Tra
nsv
erse
Off
set
(fee
t)
Longitudinal Distance from Far Transverse Joint (feet)
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Observed Shear
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End of Section
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Shear Plane
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End of Section
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Reflective Crack
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Preliminary Forensic Results
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Additional Forensic Results
0
2
4
6
8
10
12
25 50 75 100 125 150 175
Tra
nsv
erse
Off
set
(fee
t)
Longitudinal Distance from Far Transverse Joint (feet)
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Final Forensic Results
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N8 Repair Two• Forensics Showed Extensive Subgrade
Deformation
• Significant Repair Needed
• Use Design Similar to N7 (7.5% SBS)
• Make Sublot 3 Similar to Sublot 1‒ 9.5 mm NMS and Add Binder
−Similar to RBL Concept
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2009 Group Experiment (+)
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N8 Repair Two Details
• NTSS-1HM Tack Coats 0.07 gal/SY
• Average Mill Depth of 5.8"
• Bottom Two Lift Total Thickness 4.7"‒ N8-1 Like N7-1, 1.2" Thick‒ N8-3 Like N8-1 Except 0.2% Binder Added
• N8-2 Like N7-2, 19 mm NMS
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N8 Repair Two Details
• N8-1 3.2% Air Voids, 91.4% Density
• N8-2 4.9% Air Voids, 94.2% Density
• N8-3 2.1% Air Voids, 94.3% Density
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Matt After Rain
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Matt on 1/21/2011
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Improved IRI and MTD
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Use of Knowledge
• Use Repair Concept on Interstate‒ NTSS-1HM Tack Coats 0.07 gal/SY‒ Use PG88-22 Binder for Top 3 Lifts‒ Top and Bottom Lifts (1 and 3)
-Use Superpave 9.5 mm NMS‒ Lift below Top Lift: Superpave 25 mm NMS‒ Use 50 SGC Gyrations for 9.5 mm NMS ‒ 2.0% Air Voids for Lift 3 (RBL Concept)
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Spring 2012 Repair SiteI-40 Mile Posts 102-104
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Acknowledgements
• Dr. R. Buzz Powell, P.E.
• Kraton Polymers LLC
• Jeff Dean, Pavement Engineer ODOT
• AMAP
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• http://pavetrack.com
• Subscribe Dixie Contractor‒ Fournier, Paul. Failed Test Track
Section Repaired. Dixie Contractor. Vol. 84 Number 12, Dec. 2010
• ODOT 2009 Standard Specifications
Questions?